Machine for manufacturing tubing



(No Model.)

' V. BOYLE.

MAGH INB FOR MANUFACTURING TUBING. No. 574,577. Patented Jan, 5, 1897.1714718 I 27 I111 g H w k 4 2 i nawanfne I I l d? 1/, I gmiyzi wm bUNITED STATES PATENT FFICE.

VERNON BOYLE, OF PATERSON, NEIV JERSEY.

MACHINE FOR MANUFACTURING TUBING.

SPECIFICATION forming part of Letters Patent No. 574,577, dated January5, 1897. Application filed April 17, 1896. Serial No. 587,920- (Nomodel.)

iication.

My invention relates to an improvement in machines for the manufactureof tubing and more particularly to machines adapted to the making oftubes by forcing a soft mass of material, such, for example, asindia-rubber, through a die around a core. In making tubes of thischaracter there has been a tendency of the walls to collapse and becomecemented along their inner surfaces before the walls become suliicientlycool to cause them to retain their position in circular form or toprevent them from attaching themselves to an adjacent wall.

My present invention is directed particularly to means for supplying theinterior of the tube as it is formed and passes from the die with somesuitable powder or other substance which Will prevent the walls from becoming attached.

In the accompanying drawings I have represented only such portions of atubing-machine as are deemed necessary to afull understanding of mypresent invention.

Figure 1 represents in vertical longitudinal section the end of themachine at which the die is located. Fig. 2 is an end view. Fig. 3 is avertical longitudinal section showing'a modified form ofdischarge-nozzle for the discharge of the powder. Fig. 4 is an end viewof the core-supporting piece. Fig. 5 is a central transverse sectionthrough the said coresupporting piece in the plane of the line 5 5 ofFig. 4, and Fig. 6 is a transverse section through the same in the planeof the line 6 6 of Fig. 4.

The pressure-screw or plodder for forcing the material to the die isdenoted by A and is mounted in any well-known or approved manner withina hollow chamber 1) of the barrel or casing 13.

The end of the machine which carries the die and core is denoted by Oand may be secured to the barrel or casing B in any Wellknown orapproved'manner, so as to bring its hollow interior in aliuement withthe hollow chamber b, in which the plodder works. Immediately adjacentto the end of the screw or plodder A the core-sustaining piece D islocated and is preferably provided with an exterior screw-thread cZ,adapted to register with an interior screw-thread in the end piece C.The piece D is provided with a central hub 62, connected with the rim bywinding-webs 61 in the present instance three in number leavin g betweenthem and the exterior of the hub winding passage-ways d for the materialwhich is to form the tube.

The die (denoted in Fig. 1 by E and in Fig. 3 by E) is spaced from thecore-sustaining piece D by a spacing block or ring, (denoted in Fig. lby F and in Fig. 3 by F.) The dies E E are held in their position andcentered by means of set-screws e in any Well-known or approved manner,and exterior to the die there is located in the end of the piece 0 anannular nut G, which by screwing into the end of the piece 0 holds thedie and spacing-piece snugly against the core-sustaining piece D.

A core (denoted in Fig. 1 by H and in Fig. 3 by H) is screwed into theend of the hub cl of the piece D and projects through the hollowinterior of the spacing-ring and through the interior of the die,leaving between its exterior and the interior wall of the die a spacethe thickness of which it is intended the wall of the tube shall have.

Within the hub d of the core-supporting piece D there is formed achamber d which communicates by a conduit h through the core with thespace in its end and by a conduit (1 through one of the ribs d2 of thepiece D and a registering-conduit 0 through the piece 0 with a pipe, I,leading to a suitable supply of powdered soapstone or other suitablepowdered material. (Not shown.)

In the form of core shown in Fig. 1 the conduit h Within the core isprovided with several branches h, which radiate from it near its end, soas to scatter the powder throughout the interior of a tube of largesize, the conduit h being partially obstructed at k to cause a portionof the powder to travel through the said radiating-passages h.

In the form shown in Fig. 3 the conduit 72 extends unobstructedlythrough to the end of the core, and the form in this particularillustration is that which is adapted to the making of tubes of smalldiameter.

In order to provide for free communication of the conduit 0 in the endpiece 0 with the conduit (Z in the core-supporting piece, the lattermaybe chambered for a short distance along its periphery, as shown atcl, whereby the latter may be rotated in either direction past the pointwhere the axis of its conduit will be in alinement with the axis of theconduit in the end piece C, and at the same time the communicationbetween the two conduits will not be cut oil.

In operation as the tube is formed by the forcing of the material aroundthe core between it and the die the powder which is to prevent the sidesof the tube from adhering or cementing themselves to each other isforced through the conduits c, d, and lb and 71/ from the supply-pipe 1into the interior of the formed tube, so that the latter may becontinuously made and its sides allowed to collapse without liability oftheir becoming cemented together.

hat I claim is 1. The combination, with a tube-forming die and means forforcing the material which is to compose the tube, to the die of a corearound which the material to form the tube passes, the said core beingprovided with a conduit therethroug'h for supplying a substance to theinterior of the tube as it is formed and a second conduitextendingacross the path of the tube forming material into communicationwith the conduit in the core, substantially as set forth.

2. The combination with the plod der and a suitable supporting-casing atthe end of the plodder, of a die located within said casing, acore-supporting piece provided with open passage-ways therethrough forthe material to form a tube and having a conduit extending from itsperiphery to its central portion, a core provided with a conduit incommunication with the aforesaid conduit within the core-supportingpiece and means for conducting a substance through the said conduits tothe interior of the formed tube to prevent its sides from becomingcemented togetherwhen they collapse, substantially as set forth.

The combination with the skeleton coresupporting piece provided with aconduit leading: from its periphery to its central pol" tion and a dieof the core provided with a cond uit in communication with the conduitwithin the core-supportii'ig piece and passage-ways radiating from theconduit in the core and communicating; with the space at the free end ofthe core, substantially as set forth.

, VERNON BOYLE.

\Vitn esses:

FREDK. HAYNES, lRENE l3. DECKER.

